如何在图像中选择一帧来绘制贝塞尔曲线？

Question

我用皮尔绘制贝塞尔曲线在我的项目。我有路径点来画贝塞尔曲线。曲线画得很好。但我想在图像的特定帧上绘制贝塞尔曲线。我有如下数据：

{"frame":"89.062515,99.718819,175.781235,105.468742","path":
[{119.531258,4.687508,0.000000,0.000000},
 {119.531258,4.687508,111.328133,4.687508},.......]}

我想在框架中显示路径。你知道吗

这是我目前的代码：

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for image in images:
    img = Image.open("/Users/priya/Gaurav/Axonator/media/app_data/AX_User_4_Image_16_October_2015_20_14_19.395_pm.jpeg").convert('RGBA')
    draw = ImageDraw.Draw(img)
    for annotation in image["annotations"]:
        xys = []
        frame = annotation["frame"].split(",")
        for point in annotation["path"]:
            pt = point["points"].split(",")
            xys.append((pt[0],pt[1]))
        bezier = make_bezier(xys)
        points = bezier(ts)
        print points
        draw.polygon(points,outline="red")
        img.save('out.png')

def make_bezier(xys):
# xys should be a sequence of 2-tuples (Bezier control points)
n = len(xys)
combinations = pascal_row(n-1)
def bezier(ts):
    # This uses the generalized formula for bezier curves
    # http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Generalization
    result = []
    for t in ts:
        tpowers = (t**i for i in range(n))
        upowers = reversed([(1-t)**i for i in range(n)])
        coefs = [c*a*b for c, a, b in zip(combinations, tpowers, upowers)]
        result.append(
            tuple(sum([float(coef)*float(p) for coef, p in zip(coefs, ps)]) for ps in zip(*xys)))
    return result
return bezier

def pascal_row(n):
# This returns the nth row of Pascal's Triangle
result = [1]
x, numerator = 1, n
for denominator in range(1, n//2+1):
    # print(numerator,denominator,x)
    x *= numerator
    x /= denominator
    result.append(x)
    numerator -= 1
if n&1 == 0:
    # n is even
    result.extend(reversed(result[:-1]))
else:
    result.extend(reversed(result)) 
return result